Sheet stacking apparatus and image forming apparatus

Abstract

A sheet stacking apparatus includes a body, a stacking portion which a sheet is stacked, a width regulating portion configured to move between a first position and a second position closer to a center of the stacking portion in a width direction orthogonal to a sheet feeding direction than the first position, and including a regulating surface configured to regulate a position, in the width direction, of the sheet stacked on the stacking portion, and a supporting portion pivotably supporting the stacking portion. The supporting portion is disposed on the body and closer to the center of the stacking portion in the width direction, than the regulating surface of the width regulating portion positioned at the first position.

What is claimed is: 
     
       1. A sheet stacking apparatus comprising:
 a body; 
 a stacking portion on which a sheet is stacked; 
 a regulating portion configured to move between a first position and a second position closer to a center of the stacking portion in a width direction orthogonal to a sheet feeding direction than the first position, the regulating portion comprising a regulating surface configured to regulate a position, in the width direction, of the sheet stacked on the stacking portion, and a plurality of hook portions configured to engage with the body; and 
 a supporting portion pivotably supporting the stacking portion, the supporting portion disposed on the body and closer to the center of the stacking portion in the width direction than the regulating surface of the regulating portion positioned at the first position, wherein 
 the regulating portion defines a through portion through which the supporting portion passes in a case where the regulating portion moves between the first position and the second position, 
 the regulating surface is positioned closer to the center of the stacking portion than the supporting portion in a case where the regulating portion is at the second position, and 
 the plurality of hook portions comprises a first hook portion disposed more upstream than the through portion in the sheet feeding direction, and a second hook portion disposed more downstream than the through portion in the sheet feeding direction. 
 
     
     
       2. The sheet stacking apparatus according to  claim 1 , wherein the stacking portion comprises a stacking surface on which a sheet is stacked, and a projection protruding from a surface opposite to the stacking surface, and
 the supporting portion pivotably supports the projection. 
 
     
     
       3. The sheet stacking apparatus according to  claim 1 , wherein the body comprises a bottom panel, a side wall rising up from an end portion in the width direction of the bottom panel, and the supporting portion disposed on the bottom panel, and stores the sheet stacked on the stacking portion,
 the first hook portion configured to engage with a first portion, of the bottom panel, defining a first hole into which the first hook portion is inserted, and 
 the second hook portion configured to engage with a second portion, of the bottom panel, defining a second hole into which the second hook portion is inserted. 
 
     
     
       4. The sheet stacking apparatus according to  claim 3 , further comprising a rear end regulating portion comprising a connecting portion connected to the bottom panel movably in the sheet feeding direction and in a direction opposite to the sheet feeding direction, and regulating a rear end position of the sheet stacked on the stacking portion,
 wherein the connecting portion is configured to be movable to a position overlapped with the stacking portion in the sheet feeding direction. 
 
     
     
       5. The sheet stacking apparatus according to  claim 4 , wherein the rear end regulating portion comprises an engaging portion protruding in the sheet feeding direction from an end portion, in the width direction, of the rear end regulating portion, and engaging with the side wall, and
 the engaging portion is disposed farther to the center of the sheet stacking portion in the width direction than the supporting portion. 
 
     
     
       6. The sheet stacking apparatus according to  claim 5 , wherein the engaging portion is configured to be movable to a position overlapping with the stacking portion and the regulating portion in the sheet feeding direction. 
     
     
       7. An image forming apparatus comprising:
 the sheet stacking apparatus according to  claim 1 ; and 
 an image forming portion forming an image on a sheet fed from the sheet stacking apparatus. 
 
     
     
       8. The sheet stacking apparatus according to  claim 3 , wherein
 the first hook portion comprises a first protruding part extending downward and penetrating the first hole, and a first stopper extending downstream in the sheet feeding direction from a lower end of the first protruding part, and 
 the second hook portion comprises a second protruding part extending downward and penetrating the second hole, and a second stopper extending upstream in the sheet feeding direction from a lower end of the second protruding part. 
 
     
     
       9. A sheet stacking apparatus comprising:
 a body; 
 a stacking portion on which a sheet is stacked; 
 a regulating portion configured to move between a first position and a second position closer to a center of the stacking portion in a width direction orthogonal to a sheet feeding direction than the first position, and comprising a regulating surface configured to regulate a position, in the width direction, of the sheet stacked on the stacking portion; and 
 a supporting portion configured to pivotably support the stacking portion and provided on the body, the supporting portion being disposed at a position overlapping with the regulating surface of the regulating portion in the sheet feeding direction, an entirety of the supporting portion being disposed closer to the center of the stacking portion in the width direction than the regulating surface of the regulating portion at the first position and disposed further from the center of the stacking portion in the width direction than the regulating surface of the regulating portion at the second position, 
 wherein the regulating portion defines a through portion through which the supporting portion passes in a case where the regulating portion moves between the first position and the second position. 
 
     
     
       10. The sheet stacking apparatus according to  claim 9 , wherein the supporting portion is provided on one side where the regulating portion is provided. 
     
     
       11. The sheet stacking apparatus according to  claim 9 , wherein the regulating portion comprises a first hook portion disposed more upstream than the through portion in the sheet feeding direction, and a second hook portion disposed more downstream than the through portion in the sheet feeding direction.